Enhance type mapping in union #140
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This would allow mapping abstract class or interface to GraphQL types, and returning actual concrete classes in the union.
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This is an attempt to solve #139.
The idea here is, user can register a parent class or an interface in the GraphQL. When the union looks up the corresponding GraphQL type, it would try to resolve the type by the instance type, and then walk up the class hierarchy. If still cannot find any mapped GraphQL type, it would try to look at all implemented interfaces and their mapped GraphQL type.